Cttreent belaying and pboduction



Sept. 4, 1923.

D. G. M CAA CURRENT RELAYING AND PRODUCTION Filed May 18 1921 rm rw mm m OUTFU r CUPQEN T INVENTOR. WM

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QATTORNEV Patented Sept. 4, 1923.

UNITED STATES 1,466,912 PATENT OFFICE.

DAVID G. HOCAA, OF PALO ALTO, CALIFGBiNIA, ASSIGNOR OF ONE-HALF 'IO CORNE LIUS D. EHBET; OF PHILADELPHIA, PENNSYLVANIA;

CURRENT BELAYING AND PRODUCTION.

Application filed May 18, 1921.

To all whom it may concern:

Be it known that I DAVID G. MCCAA, a citizen of the United states, residing in the city of Palo Alto, county of Santa Clara,

6 State of California, have invented a new and useful Current Relaying and Production, of which the following is a specification.

My invention relates to the relayin and 10 production of current by dynamoectric action. 4

My invention resides in the method of and apparatus for relaying electric current by causing one. current, generally weak and fluctuating or alternating, to set up in a circuit containing or related t0. a source capable of delivering relatively powerful current, a controlling electro-motive-force by dynamo-electric action; v a

.,-My inventionj? residesmfurther 1in the method of and apparatus for producing fluctuating or alternating currentor oscillations of any suitable frequency by coupling; preferably inductively, a circuit -containing a source'of current',jas direct current, and an armature of a dynamo-electric machine with acircuit, which-may be? the output circuit or coupled to, an output circuit, containing the field windin of the dynamo-electric machine andyin addition, preferably, a condenser.'- I

.My invention residesinzthe, method and apparatus hereinafter described and claimed.

, For. anFillustration of some? ofthe forms my apparatus may take, and for an under- 35 standin -.of my method, reference is to be had to e accompanying drawing, inwhich:

. Fig. 1 is a diagrammatic view of relay circuits. v a i Fi 2 is a fragmentary view illustrating a 40 mod cation;

Fig.3 is adiagrammatic view of circuits for producin fluctuating or alternating currentor osc' ations.

'Fig. 4 comprises front and'side views of. a

disk armature. 7

Fig. 5v represents a modeof use of the disk armature; y

Referring to Fig. 1, the conductorstl and 2 are those of an input circuit delivering currentas a fluctuating or alternating current, including telegraphic, telephonic or other signaling current, to the field' windings F, F of a dynamo electric machine having an armature A, of the direct current type, having a commutator C. As indicated,

Serial No. 470,536.

the field may be provided with pole members a, a, of iron when the frequency of the input current is sufliciently low, the iron structure being preferably suitably finely laminated or subdivided. In circuit with the armature A is a direct current generator G or any other suitable source of direct current, as a battery, etc.; and the primary P of a transformer whose secondary S connects to the output circuit by conductors 3 and 4, the output circuit containin a tele-' hone receiver or any other suitabfiatransating instrument whichis to be affected by a current greater thanthat delivered by the input circuit. The primary P may be shunted by a condenser K of capacity suited to circumstances for shunting around the primary P the parasitic current variations due to the commutator C. i Y The transformer may have a laminate iron core b when the frequencies dealt with are not too high.

The armature A is rotated b any suitable means, as, for example, an elbctric motor, not shown.

With no current in the input circuit, there will flow through the circuit of the armature A and primary Pasteady or unmodulated direct current. If, however, a fluctuating or alternating current is delivered by the input circuit, the magnetic field in which the armature A rotates will fluctuate or alternate in correspondence with the input current, with the result that the'armature A will generate electro-motive-forces coinciding with or opposing theelectro-motiveforce of the source G and so cause modulation of the direct current into-fluctuating current, the fluctuating component bein transformed by the transformer P, S,'an causing delivery of relatively powerful fluctuating or alternating current to the output circuit.

Notwithstanding great power of the source G and weakness of the input current. the heavy current delivered by the source G is nevertheless controlled by the electromotive-forces set up in the armature A by its rotation in the field produced by the weak input current.

The efi'ect described, which may be con sidered a trigger effect, is the greater the higher the speed of rotation of the armature A. For example, a telephonic current or a. current representing a radio signal Gil or mesage, may ,deliveigerfitp the appaeag tus by-theoiidudt ors 1 an 2, 'ant l iii-the output circuit will appear a l ke telephonic or other current-g eat y mgmfi d: .J. Iii lieu of empIo ingLthecur-r ent m. an output circuit, the conti'lled current from the source G may be employed .to operate the ordinary relay contacts controlling a circuit including a fnrthensource Ofenergy and translating device. This is indicated in Fig. 2, wherethewinding P -is';'.ei'npl'oyed as that of an electrofi imignet having an arma ture 0 carried by'{aL" leaf-"spi'ingd normally resting against a stopwr' conuict e, An'arlf justrnent may bemn'de j such-that normally the armature c will notbe attraeted,bu t will be attracted ripon presen'ceofci'irrent in the input'eircuit- I and 2-,'the"resoltant attraction of the armature 'o carrying the' 'sprmg d awayfrom the=stop=orcontact' 'eand so breaking a circuit comprising? the conductors and h connecte'd, respectivelygto'the spring (band contact e'. employing a," contact i-a relay circuit, compris ng the 'conductors g -and j niay-"be' olfo'sed upon attraction of the 'arniatu-re 0. @Referrir'rg to Fig. 3', there isjjIIustrated apparatus similar to that iaboi e described for producing from uni-directional or direct current ailternatingcui'rjntbr"oscillations, As before; the circuit oft-the armature A includes the source G and the transformer primary 'P. Thetransforme'r secondary S, ho ever, isconnected in circliit with the field winding F, F and the condenser K? to forrir' an out-putgcircuit-whicli may be connected directly to"-the ;tlbnd1ictors 5*ahd 6, or which maybe inductively coupled, "as illustrated, by transformeT=Tl? ','S to'jthe out; putcircl1it;'-'(-,*8. 15 f -When a-cu'irent from the source G=in creasing or rising in'theprirhary Pests up in.:the circuit of thes'econdaryfs and fie'ld winding- I, an electro-rnotive-force or-current of a certain direction, withgsuitable arrangementsiand connection of the' winding's the secondaryelectrmmotive-force or current acting in the winding's F, 1 causes production in=the armature A of an electromotive-forcm opposing the electro motive forcemf the source'G- and causes current in the primary'P to'*fail. 'When the current in the primary P so falls, there will be set; up in the secondarycirenit a'curre n'tin reverse sense to 'that- 'n'eiviously"eizistiug; with the result that the wlaniing 's F, -will'now set up a magntic fi'eld that causes the armature A to produce'electro-motive force assisfin the electro-motiire-force-of the source thereby causing a rise in current "in the primary P A2I1dso on, this-actionis cycli- (tally-repeated, with the'result'that in the secondary circuit there is a periodically rising and falling current, which may be directly delivered to 'an output circuit, or

wh h in P i g: rough: h -prim ry induces an altern'atiri r" current 0% oscillations in the secondary S which delivers to the outputcircuit 7,, 8 1 l The frequency; o,f -the current or oscillations s6 produced rnay he controlled by sultably adjusting; the; relative magnitudes of the capacit of the condenser K and of the inductance in circuit.

l/Vith respect to both Figs. 1 and 3, the armature A, particularly -when high-frequencies-are involved, inay take' the form of a disk, as indicated in Figs. halid 5, the armature struc-tur'e being without iroii when the frequencies involved are high. 'As indicatedin'F-ig. 5, the disltarmat'ure A may-be associated with a plurality ofsets of field windings F, the field also being without iron when high: frequencies-are involved: What I claim is: 1 1. The anethod of producing fluctuation in amplitude of-=an'electric currenhdyna mo elec'tric a itioneflected by relativemove ment of an armature winding an'd' a magnctic field. 'which 'comprise's passing the current through the-armature, and produc inf: fluctuation in "the strength of 'the magnetic field, whereby the fluctuatingeleetromotive-force generatedby the 'armatiire (fleets/fluctuation of said current passing throughsaid-armature;

2.--The method of producing-fluctuating or alternatin current or; "oscillations by dynamo-electric action efie'cfred *by relative movement of an armature"windingfantl'a magnetic 'field' which comprises A passing direct: cunentthrough the armature wind i'n-ggi and va'x vingthe strength of therefrignetic field by a currentinductii 'lj'derived from' fluctuation of magnitudeofs d current; x13 -5 -.m The method of producing fiuetuating or alternating-current or oscillatioiis by dynamo-electric action "effected by rehtiv'e movement of an -armaturewinding= and a magneticfield pmduced bycnrrent tr ave'rsin; a field winding, which comprises pass-' ing a direct cuITent'through said"arn iaiture winding, and inductively coupliiig'g; the ci'r suits "of said armature and field windings, whereby said'circuit's react uponeach' othe'r to cause fluctuation of the current passed through said armature windin'i'and of the current induced in said field winding.

4. Apparatus for producing 'iilternaiting current comprising a source of direct c'ur rcntfa direct current armature in circuit therewith, a fie'ld winding with r'espectt o which said arm'atureiis rotated,-;aqd a coupling between the c'ircui'ts ofsaid'armatu're and said fi'clrl wiiiding. 5. Apparatus for producing alternating current comprising 'a sour-cc of direct 5m rent, a direct current armature in circuit therewith, a field winding with respect to which said armature is rotated, a winding in circuit with said armature, a winding in circuit with said field winding inductively coupled to said last named winding, and a condenser in the circuit of said field winding.

6. Apparatus for producing alternating current comprising a source of direct current, a direct current armature in circuit therewith, a field winding with respect to which said armature is rotated, a winding in circuit with said armature, a winding in circuit with said field winding inductively coupled to said last named winding, a condenser in the circuit of said field winding, a transformer primary in the circuit of said fleld winding, and an output circuit connected to the. transformer secondary.

7. Apparatus for producing fluctuation in amplitude of an electric current comprising relatively moving armature and field windings, a source of current in circuit with said armature, and means for causing fluctu ation in the field current for producing in said armature an electro-motive-force similarly fluctuating and similarly varying the magnitude of the current passed through said armature.

8. Apparatus for producing fluctuation in amplitude of an electric current comprising relatively moving armature and field windings, a source of direct current in circuit with said armature, and means for causing fluctuation in the field current for producing in said armature an electromotive-force similarly fluctuating and similarly varying the magnitude of the current passed through said armature.

9. Apparatus for producing fluctuating or alternating current or oscillations comprising relaltively movable airmature and eld windings, means for passing a current through said armature winding, and means for effecting reaction between the armature and field windings, whereby fluctuations of field efi'ect fluctuations of current through said armature and in turn said fluctuations of armature current efi'ect fluctuations of said field.

10. Apparatus for producing fluctuating or alternatin current or oscillations comprising relatively movable armature and field windings, means for passing a direct current through said armature winding, and means for effecting reaction between the armature and field windings, whereby fluctuations of field effect fluctuations of current through said armature and in turn said fluctuations of armature current effect fluctuations of said field.

In testimony whereof I have hereunto afiixed my signature this 11th day of May,

DAVID G. MoCAA. 

